<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>省市级联操作</title>
</head>
<body>
    <select>
        <option>--选择省份--</option>
    </select>省
    <select>
        <option>--选择市--</option>
    </select>市
</body>
<script src="js/jquery-3.3.1.min.js"></script>
<script>
    $.ajax({
        type:'get',
        url:'demo/proList',
        success:function (data) {
            alert(data);
        }
    });
</script>
</html>